add mrb_mod_remove_method/remove_method
add test for Module#remove_method
Merge pull request #677 from skandhas/pr-add-Module-remove_method

Add Module#remove_method for mruby
Fix a wrong comment
Merge pull request #678 from authorNari/patch-1

Fix a wrong comment
Rebuild CRuby based building script without Makefile

Tested CRuby 1.8.6 and 1.9.3

You can see building configuration in build_config.rb
Merge pull request #679 from masuidrive/merge_to_cruby_building_script

Rebuild CRuby based building script without Makefile